Hydrothermal syntheses, crystal structures and physicochemical properties of 2-D and 3-D inorganic coordination cobalt(II)-sulfite polymers
Φόρτωση...
Ημερομηνία
Συγγραφείς
Chilas, G. I.
Lalioti, N.
Vaimakis, T.
Kubicki, M.
Kabanos, T.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Royal Society of Chemistry
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Dalton Transactions
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The hydrothermal reaction of [Co(III)(NH(3))(6)]Cl(3) with Na(2)SO(3) yields, depending on the concentration of Na(2)SO(3), compounds {Na[Co(2)(II)(SO(3))(2)(mu(3)-OH)(H(2)O)]}(infinity) (1) and {Na(4)[Co(2)(II) (SO(3))(4)]} (2). When (NH(4))(2)SO(3)center dot H(2)O was substituted for Na(2)SO(3), the trinuclear mixed valence cobalt(II/III) complex (NH(4))(4){Co(II)[Co(III)(SO(3))(3)(NH(3))(3)](2)}center dot 2H(2)O (3 center dot 2H(2)O) was isolated. The cobalt-sulfites 1-3 center dot 2H(2)O were structurally characterized. In 1, the 1-D chains along the a-axis of the subunit [Co(I)I(2) Co(II)(3)(OH)(2)(SO(3))(2)] are cross-linked with Co(II)(1) atoms via Co-O(sulfite) and Co-O(hydroxide) bonds in 2-D sheets, that are further stacked through interlayer hydrogen bonds. In 2, the [Co(2)(II)(SO(3))(2)](infinity) chains along the b-axis are cross-linked with tetrahedral cobalts via Co(II)-O(sulfite) bonds in 2-D sheets parallel to the ab-plane and the sheets are further bound to sodium atoms via Na(+) O(sulfite) bonds to form a 3-D structure. The 3-D inorganic coordination polymer, 2, crystallizes in the non-centrosymmetric space group P2(1)2(1)2(1). In addition, in compound 2 octahedral and tetrahedral cobalt atoms coexist, which is rather unusual for cobalt clusters. Compound 3 center dot 2H(2)O is a 0-D mixed-valence {[(NH(3))(3)Co(III)(mu-SO(3))(3)]Co(II)[(mu-SO(3))(3)Co(III)(NH3) 3]} 4-trinuclear cluster and can be considered as an octahedral {Co(II)O(6)} complex ligated to two tridentate [(NH(3))(3)Co(III)(SO(3))(3)](3-) ligands. The trinuclear clusters are stacked through an extended network of hydrogen bonding into a 3-D structure. Variable temperature magnetic susceptibility studies for 1-3 center dot 2H(2)O revealed that 1 and 2 are 2-D magnetic systems with strong antiferromagnetic interaction between the Co(II) atoms leading to an S = 0 ground state for 1, while in compound 2 there is an almost zero interaction between the cobalt(II) atoms leading to a non-zero ground state. The trinuclear compound 3 center dot 2H(2)O has two diamagnetic Co(III) atoms and a high-spin Co(II) atom with D = 84(1) cm(-1), E = 6(1) cm(-1) and g = 2.56(1). The IR, the solid-state UV-vis spectra and the thermogravimetric analyses of compounds 1-3 center dot 2H(2)O are also reported.
Περιγραφή
Λέξεις-κλειδιά
trinuclear cobalt complex, bond-valence parameters, x-ray structures, magnetic-properties, bridging sulfito, metal-complexes, building-block, ligands, oxidation, selenites
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000281230700025
http://pubs.rsc.org/en/content/articlepdf/2010/dt/b920710d
http://pubs.rsc.org/en/content/articlepdf/2010/dt/b920710d
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας